Page 321 - Gas Detection Systems Training Manual

5.5.2 Set 3100 Clock Screen
1) Setting an individual 3100 clock or all 3100 clocks on the specific SEC 3500 Loop 485 Modbus; is accomplished by either pressing the “Change Now” button to the left, or pressing the “Set All 3100 Clocks Now” to the right in the middle of the screen.
2) When Changing only one 3100 clock, the desired SEC 3100 unit to change can be changed by pressing the Device ID field and changing the number in the popup keypad that will show.
3) When a 3100 clock is being set, the current HMI date and time as displayed above, are copied into the 3100 device shown above to the right. It will advance the 3100 clock a few seconds if necessary so that the net result is close to the HMI time, however during the process, it continuously retrieves the latest HMI time. If the minute, hour or date is within thirty to fifteen seconds of rolling over, then it will wait until the rollover occurs, and then applies the set-ahead principle just mentioned. When a clock is done, it can be as much as five seconds behind the HMI due to the number of polls of the 3100 clock needed to validate; and this does cause some latency.
4) When all clocks are being set, the process marches through all 3100 devices on the bus that are in a proper state to accept clock changes; hence it is possible that all 3100 clocks on the bus are not changed. This is a very efficient way to set 100’s of clocks.
5) Press “Main Screen” when clock setting is complete.
6) Transitioning to or from this screen results in transitioning through the primary loop
stop and start screens, as previously described in “Startup Basics Guide” section 3.0 (2) and (5).
Sensor Electronics Corporation 5500 Lincoln Drive Minneapolis, Minnesota 55436 July 28th, 2007
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SEC 3500 OI Basic Operator’s Manual Version 2.1.0095